Re: [PATCH bpf-next v3 8/8] bpf: add a selftest for cgroup hierarchical stats collection

From: Yonghong Song
Date: Mon Jul 11 2022 - 02:20:01 EST

On 7/10/22 11:01 PM, Hao Luo wrote:
On Sun, Jul 10, 2022 at 5:51 PM Yonghong Song <yhs@xxxxxx> wrote:

On 7/10/22 5:26 PM, Yonghong Song wrote:

BTW, CI also reported the test failure.

For example, with gcc built kernel,

The error:

get_cgroup_vmscan_delay:PASS:cgroup_id 0 nsec
get_cgroup_vmscan_delay:PASS:vmscan_reading 0 nsec
check_vmscan_stats:FAIL:child1_vmscan unexpected child1_vmscan:
actual 28390910 != expected 28390909
check_vmscan_stats:FAIL:child2_vmscan unexpected child2_vmscan:
actual 0 != expected -2
check_vmscan_stats:PASS:test_vmscan 0 nsec
check_vmscan_stats:PASS:root_vmscan 0 nsec


I noticed that the test only failed on test_progs-no_alu32, not
test_progs. test_progs passed. I believe Yosry and I have only tested

In my case, both test_progs and test_progs-no_alu32 failed the test.
I think the reason for the failure is the same.

on test_progs. I tried building and running the no_alu32 version, but
so far, not able to run test_progs-no_alu32. Whenever I ran
test_progs-no_alu32, it exits without any message. Do you have any
clue what could be wrong?

It works fine in my environment. test_progs should be very similar to
test_progs-no_alu32. The only difference is bpf programs with different
insn set. Some tests may not run with test_progs-no_alu32, e.g., newer
atomic insn tests.

I have no idea why test_progs-no_alu32 won't work for you, I guess you may need to debug it a little bit.